How can I make my internet connection work?

I have a Windows XP laptop, and I have a external wireless card. It detects the connection and says that it is connected to the internet, but the internet does not work. When I try to connect directly with my modem, again the internet does not work. I know my wireless adapter works because I tested it with another computer.

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Why does internet not work when laptop is connected directly to modem?

Okay i have a dell laptop and all of a sudden i cant connect to the internet, I have the computer directly connected to the modem and when i use the internet it still does not work what is wrong?! i’ve tried everything! Shouldn’t the laptop automatically connect to the internet since it is connected to the modem?

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Laptop does not connect to wireless access point !?

Yesterday night when i was watching 微笑Pasta on PPStream , my internet speed suddenly drops.
Then my laptop got disconnected with my home’s wireless access point. So i connected it back again but after a few seconds , it disconnects. I switched off and on my modem and wireless router but still , once i connect to my wireless access point , it disconnects again.

It got worst , now , windows is not even able to detect my home’s access point when it’s turned on.
But it works when i plugged in the LAN Cable through the wireless router.

What to do ? Router spoiled or something ?

Router settings :
Locked , WPA2-Personal.

It’s a TP-LINK Router.
TP-WR340G
54 MBPS WIRELESS ROUTER

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I can't go on the internet with my computer on the wireless adapter?

I have 2 desktop computers. One is on the westell 3911 modem, the other is on the netopia wireless adapter. The wireless computer is not able to pull up a web page and when it has , it gets diconnected. What gives?

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